According to a new study out of Japan, a chemical used in the cooking of the fast food giant’s fries could be the key to curing baldness.

Stem cell researchers at Yokohama National University succeeded in regrowing hair on mice by using dimethylpolysiloxane to mass-produce “hair follicle germs,” or HFG. Dimethylpolysiloxane is the silicone that is added to McDonald’s fries to prevent the oil from frothing.